Lathe control mechanism



June 23, 1953 R. H. sHADRlcK LATHE CONTROL MECHANISM 12 Sheets-Sheet l Filed May 27, 1946 June 23, 1953 R. H. sHADRlcK 2,642,549

LATHE CONTROL MECHANISM 5 Filed May 27, 194e 12 sheets-sheet 2 FIL- E E June 23, 1953 R. H. sHADRlcK 2,642,549

LATI-1E CONTROL MECHANISM.

Filed May 27, 194e 12 sheets-sheet s FI :E E /59Z FEE E ,7 @3W @Mlm e June 23, 1953 R. H. sHADRlcK 2,642,649

LATHE CONTROL MECHANISM Filed May 27, 1946 12 Sheets-Sheet 4 FEE 4- MJL/fab' June 23, 1953 R. sHADRlcK LATI-IE CONTROL MECHANISM 12 Sheets-Sheet 5 Filed May 27, 1946 June 23, 1953 R. H. sHADRlcK 2,542,549

' LATI-IE CONTROL MECHANISM Filed May 27, 1946 l2 Sheets-Sheet 6 Il 'I )UWUHII June 23, 1953 R. H. sHADRlcK 2,642,649

LATI-IE CONTROL MECHANISM Filed May 27, 1946 12 Sheets-Sheet 7 FIE E June 23, 1953 R. H. sHADRlcK 2,542,649

LATI-1E CONTROL MECHANISM Filed May 2'?, 1946 l2 Sheets-Sheet 8 me/rm R/CHRD H. SHADE/CK June 23, 1953 R. H. sHADRlcK 2,642,649

LATHE CONTROL MECHANISM Filed May .27, 1946 12 Sheets-Sheet 9 FICE :Ll

FIE': 1E

ma, QMMJ June 23, 1953 R. H. sHADRlcK 2,642,649

LATHE CONTROL MECHANISM Filed May 27', 1946 12 Sheets-Sheet lO FIE :LZ:

R/cHA/w A'. sHADR/CK s U2/@ W Q June 23, 1953 R. H. sHADRlcK 2,642,649

LATI-IE CONTROL MECHANISM Filed May 27, 1946 l2 Sheets-Sheet 1l FIL- '14 27 E se 'June 23, 1953 R, H, sHADRlCK 2,642,649

LATI-IE CONTROL MECHANISM Filed May 27, 1946 12 Sheets-Sheet l2 FIE .1E

,345 3/0 me/who@ mc/mko H sHAoR/c/f Patented June 23, 1953 "UNITED STATES PATENT OFFICE LATHE CONTROL MECHANISM Richard H. 'Shadrick, Minneapolis, Minngassignor, by mesne assignments, to Robert Hacking, Paul Hacking, and J. J. Panucci Application May 27, 1946, Serial No. 672,506

This invention relates to improvements in control mechanisms for indexing tool carriers, such as the turrets used upon turret and engine lathes.

'Ihe primary object of the invention is to provide a compact, simple and efcient mechanism for installation either upon the latheV itself, or arrangement in connection therewith, and operative to move or traverse the turret, and its tools, toward and away from the work and with automatic, preselected and precise control over the feed rate.y Y

Another object is to provide mechanism of this kind which will operate to first feed the tools toward thework at a rapid rate, then automatically shift the rate of feed to a proper cutting speed'according to the characteristics of each tool, and then return the turret rapidly at the end of the Working stroke, completing the traverse. Another and related important object of the present invention is to provide a feed mechanism wherein the point at which the working stroke shifts from the high advance speed to the controlled feed rate may be individually adjusted for each tool carried by the turret, thus to save all possible time in the operation of the machine.

Another object is to provide a control unit or mechanism having convenient controls and adjustments for initially setting up the machine for different feed rates as required, for stopping the work at any time and for controlling the .repeat operation after all tools have operated on the work. j

Another object is to provide a control mechanism useful also for tapping operations, and

providing a regulated feed speed for thetap and a corresponding regulated return movement for backing out the tap.

Still another object is to provide a control mechanism of this purpose which is hydraulically actuated, which will operate smoothlyunder 16 Claims. (Cl. 2li- 42) v all load conditions, and has adequate .power for heavy cuts but with a cushion eect and a preciseness in control making it suitable for the finest of precision work.

These and other more detailed and specific objects will be disclosed in the course of the following specification, reference being had to the accompanying drawings, in which- Fig. l is a front elevation, partially broken away and in section, of a part of a turret lathe with one form of my control mechanism attached lto the lathe bed and connected to the tool turret. Fig. 2 is an enlarged end View, looking at the right hand end of the assembly of Fig. 1.

partially diagrammatical view through the mainl part of the control mechanism, looking at the same from the rear, or side opposite that of Fig. l, and illustrating the position of certain parts, as the turret approaches the end of its working stroke toward the work.

Fig. 4 is a similar View, but showing the parts inthe positions assumed as the turret approaches the end of its return stroke. f l

Fig. 5 is a planl view of portions of the'control mechanism and part of the turret slide or carrier, and illustrating the connections therebetween and the operating means for the restoring valve.

Fig. 6 is a fragmentary detail sectional view substantially along the line 6 6 in Fig. 4` and showing certain details of the feed regulating or metering valve assembly.

Fig. '7 is a front elevation of a mechanism in accordance with my invention but rmodified slightly from the showing of Figs. 1-6.

Fig. 8 is aV rear view of the structure shown in'Fig. 7.

Fig. 9 is an enlarged fragmentary rear elevation of the main valve actuating cam and adjacent parts.

Fig. 10 is an enlarged end view lookingvatthe right hand end of the mechanism as disclosed in Fig. '7.

Fig. 11 is a fragmentary vertical sectional and elevational viewl substantially along thehline Il-II in Fig. 10 and showing details of the metering valve. f

Fig. 12 is an enlarged vertical sectional View along-the line I2-'I2 in Fig. 8. t

Fig. 13 is an enlarged'fragmentary perspec.. tive view of a portion of the mechanism'showing the selective repeat control, control handle and associated parts.

Fig. 14 is aview similar to the, right handportion of Fig. 7 and showing a tapping attachment orv means for selectively regulating the travel in two directions as necessary for tapping work..k

Fig. 15' is an enlarged fragmentary vertical sectional view along the line l5`l5 in Fig. 14.

Fig. 16 is an enlarged fragmentary detail sec-- tional and elevational view of the tapping speed regulatingy or meteringy valve and associated parts,fshowing the same in inoperative or in- Figs. 1-6

shown, is essentially conventional, comprising a bed Ay a turret support B adjustable to any selectersing movements in and upon thev support B,"v

and a turret or turret head-D adaptr-rdfto carrysix, more or less, evenly radially spacedtools (not shown). The turret D is rotatableabout a Aver#y tical axis and in operation is indexed aroundinsteps to present the tools in succession to the work. y

As herein shown (Fig. 1 particularly), the turret D and its carrier -or slide C is moved to-the left. to present the tools to the work being processed', and returned to the'right to withdraw the tools from the work, while the indexing operation takes place, or while a finished workpiece is removed from the machine. The mechanism of my invention accomplishes these advance and return movements of turret and slide automatically asV willl presently appear, and the indexing ofthe turret takes place asv the slide follows through its return stroke. This indexing movement-is brought about in the conventional manner and it is sufcient to state herein that the turret carries depending,Y evenly spaced pins E (Fig. l) ,v equal in number to the tool stations on the turret, which engage a pawl- F and turn the turret a step each Areturn stroke. The pawl may, byconventional means Gpbe moved out of position for engaging the pinsE to-ndex the turret, when it sdesired to-r'epeat the operation of one tool.y A shaft H is journaledlengthwise beneath the slide VC and is rotated, as the turret is indexed, by bevel gearsV I which connect it tothe turret, and this shaft carries a stop screw'disk Jin-Which rare threaded radially spaced stop screws-K equal in number to the tool stations on the turret. The purpose of these screws will presently appear.

The mechanism of my invention comprises la frame having a base I which is secured upon the lathe bed-A adjacent the. right hand end thereof ina position Awhereat the frame will vclear the 1eme slide as it reaches the end of itsrerurn stroke. End plates or members 'I Band I1 extend rigidlyupwardly from the-ends ofthe base vvplate I5 and are tied rigidly together by front and rear tie plates I8 and I9 -secured'in placeby screws v20, Vsaid plates I8 and I9 vas seen in Fig. 2 also overlying the upper ends of the ends IB and I1. tangular frame and at a level above that of the turret slide C the frame supports a cylinder 2I the `ends ofwhich are recessed into and clamped tightly'between the frame ends I6 and l-'I (Figs. 3 and 4). A piston 22 is mounted for reciprocation in tliepcylinderY 2|: and a piston rod ,23 attached to the piston extends out through the end I6 toward theA adjacent end' ofY- the slide C to 'which this end of the' rod is .connectedV by a bracket. a'ssemblyZl.v This assembly comp-rises an angle-shaped bracket secu-red by its base flange at 26Yto the slide C and having in `its upright flange an upwardly opening notch 21 in whichnicely ts a diametrically reduced end portion 28 of the piston rod 23. A plate `29 is This assembly thus for-ms a rigid reced position lengthwise along the bed, a turret-,71,9

carrier or slide C reciprocably mounted` fortrav-V secured by a cap screw 30 crosswise to the end of the piston rod and this plate is yieldably urged away from the upstandng, notched ange of the bracket 25 by expansion coil springs 3l, thus normally holding the shoulder at the junction of the piston rod with the reduced end 28 tightly against the margins of the notch 2,1. The foregoing arrangement is obviously such that the reciprocation of the piston 22 inthe cylinder 2I will cause a corresponding movement of the slide C, the movement of the piston to the right as viewed4 in-Figrs. '3 and 4 carrying the slide (and turret D) through nits yadvance or feed stroke, and

.vice versa.` The springs 3| provide a shock absorbing action between the piston and slide in one direction to take up the jar which occurs whenY the feed movement is completed and the slide travel is sharply reversed to carry it through its rapid return stroke as will be described.

The piston 22 of the hydraulic motor constituted'by 'the' piston' and its cylinder 2| is power reciprcated in both directionsin the cylinder by fluid vpressure supplied by a suitable pump (not shown) the output pressure of which is deliveredto ,the machine by a supply pipe 32, and

excess or displaced iiuid is returnedto a reservoir (also notjshown) supplying.` the pump,` by a discharge`pipe33. l `1 Y Fluid from the supply pipe 32 is admitted to opposite ends of the'cylinder 2I selectivelyk and in proper sequence by a multiple valve system embodying ve valves in all and these valves will now be described in order. f

The primary controlover the fluid flow and A operation of the machine asla wholetisa'main control or shut ofi" valve 33" arranged at the rear of the mechanism and havingan inlettting 34 to Vwhich'the'ppe 32v is'conn'cted. Fluid is thus continuously/'supplied to 'an upper chamber 35(Fig. V2)V in the valve, -above'a partition 36in which is a valve opening 31 normally closed by a spring depressed valve disk 38.` The valve 38 may, however, be upwardly unseated against its spring, by afpush rod 39 extending upwardly through' anfttin'g 40"inthe bottorn'of vthe valve. This push rod 39 is vertically reciprocated to open and close the valve by a cam 4I secured to the e'nd fof a shaft 42 and positioned below a lifter 43v fitted on the bottom of the push rod'. A'pracket 4 4 secured to the base plate I5 intermediate thef ends I6 and I'I is horizontally bored, front to' back, to rotatably receive the'shaft 42 and` at its rear end has an apertured lug 45 in which the lifter 43 is slidably supported above the cam 4I.. d is bent/upwardly to form a handle 46 upon the extremity of which is secured a knob 4T. When the handlel, isnmoved toa vertical position the nose of the cam (Figs. 3 and 4) is Amoved up beheath the lifter 43 `to move the push rod 39 upwardly'jand unseat the valve disk 3,8, as seen in Fig. 2, while movement of the handle 46I to either side from centrer will vcause the cam to allow the push rod to descend and the valve to'close. Thus the machine may be shut off quickly by knocking the handle in either direction from center in an emergency. A plate 48 secured to the front end of the bracket 44 has ears 49 which lie in the path of the handle 46 limiting its off movement to either side andcausing it to' stop in a d position convenient for return to on position.

The valve 33 also has a lower chamber 50 into which fluid willflow when valve disk 38 is opened 'and communicating with this chamberis va nipple 5I by which the valveis rigidly supported upon The forward end of the shaft 42 the adjacent side of, and is connected for fluid transfer to, a reversing or piston control valve indicated generally at 52. Said valve 52 is yof the piston or plunger type and the operating element per se will be later described. The valve 52 rcomprises a housing having a longitudinal-bore 53 over the ends of which are fitted and secured end castings 54 and 55 flanged to form feet 56 by which the valve may be screwed and supported atop the front and rear tie plates |8 and |9 as clearly shown. The housing or body 51 ofthe valve 52 is generally rectangular in shape and on the side facing the valve 33 it has a bossed and tapped opening receiving the nipple and leading into an inlet chamber 58 communicating through a circumferential groove 59 with the center of the valve bore 53. On the opposite front side of the valve body 51 there is a similar bossed and tapped opening to which the return pipe 33 is connected by a suitable tting or elbow 60 and this opening communicates with an outlet chamber 6| in the body. Said outlet chamber 6| has passages 62 and 63 leading in opposite directions and communicating with the bore 53 through grooves 64 and 65 spaced widely to opposite sides of the groove 59.

Intermediate the grooves 64 and 65 and the groove 59 the valve body 51 also has grooves 66 and 61 which communicate, respectively,l with chambers 68 and 69 in the top ofthevalve and downwardly into which are tapped a nipple 10 and a tubing tting 1| respectively.

The third valve in the series controlling piston 22 is a metering or feed regulating valve which is located in the frame end |1. The valve element, per se, is a ball 12 which is loosely mounted in a chamber 13 formed in the upper, center portion of the end |1 and tapped at its upwardly opening end to receive a fitting 14 from which extends a tube or line 15 to the aforesaid fitting 1| on the reversing valve 52. The valve ball 12 cooperates with a valve seat or bushing 16 seated at the bottom of the chamber 13and downwardly tapered on its inner periphery to accommodate the ball. Upward movement of the ball is limited by a stop pin 11 depending fromthe tting 14 but before the ball strikes such pin (Fig. 4) it will fully clear the seat 16.

Vertically slidable belowthe ball 12 is a metering plunger or piston 18 mounted in a bore 19 extending downwardly from and communicating with the seat 16. The upper end of this plunger 18 is reduced at 80 to clear the seat and will, when the plunger is moved upwardly, unseat v'the ball. The vertical position of the plunger 18 will thus regulate the flow past the ball 12. Substantially in alignment with the axes of the cylinder 2| the plungerl 18 has a diametrical opening 8| ared or beveled out on the side nearest the cylinder and the piston 22 has affixed thereto a lifter pin 82 the extremity of which is tapered as shown at 83. This pin82 is adapted, as the piston 22 moves on its return stroke, to penetrate the opening 8| and the tapered end 83 facilitates its entrance thereinto. The arrangement is such that, as the pin 82 enters opening 8| it will cam the plunger 18 upwardly (Fig. 4) a short distance. As the pin 82 penetrates opening 8| it enters a recess 84 in a plug 85 secured on the frame end I1, it being understood of course that said frame end 1 has openings 86 traversing the plunger bore 19 to clear the pin.

The lower end of the metering valve plunger 18 terminates just above a large opening y81 formed through the lower portion of the frame disk 89 the sleeve 90 has secured thereto'a hub 9| having a flange radially slotted at 92 to engage drive screws 93 in the end of the disk and the arrangement is such that the step by step rotation of the sleeve90 by shaft H will be transmitted to the disk. The sleeve 90 has freedom for limited sliding movement with respect to the disk 89, while maintaining driving connection between the slots 92 and cap screws 93, to compensate. for

shocks as the machine travel reverses, butsuch movement is limited by collars 94 positioned on the sleeve to each side of the bracket 44.

The disk 89 projects beyond the exposed end surface of the frame end I1 some Ydistance and is notched at equally spaced points as seen at 95 to receive a tooth 96 on a latch lever 91 which is pivoted at 98 (Fig. 2) and biased by a spring 99 to'normally urge the tooth into the notches in succession as the disk` is intermittently rotated.

These'notches 95 correspond in number and angular spacing to the tool stations on the turret D and to the stop screws K as will be understood.

In the plane of the groove 88the disk 89 is pro-` vided with a series of evenly spaced radial recesses or bores |00 equal in number and angular spacing to, and aligned with, the notches 95 and in .these recesses there are slidably positioned metering pins |0| having reduced outer ends |02 adapted successively to be brought up beneath the lower end of the plunger 18. Actually these ends ofpins |0| engage a leaf spring |03 .which A- is positioned tangentially with respect to the periphery of the disk 89 ina horizontal hole |04 bored front to back through the vframe end I1. One end of the spring |03 is anchored at |05 and the spring stands between the uppermost pin |.0|

. and lower end of the plunger 18.

The metering pins 0| are pierced withl diametrically extending and oppositely tapered openings |06, intermediate their ends, which are aligned with bores |01 bored into the disk-89 inwardly from its outer end parallel with the axis about which it turns and traversing the recesses 0|. These bores |01 are tapped to receive ad# justment screws |08 the inner ends of which have long even tapers, as designated at |09, where they pass in and through the openings k| 96. The openings 1|06 arelarger than the screws |08 and the arrangement is such that', as the screws f are turned in, their ends |09y will camV against the outer marginsr (with respect to the axis of the assembly) of the openings |06 to move the pins |0| radially outward. The position' of the pins 0| and the extent of their projection beyond the peripheral surface of the disk 89 may thus be precisely and individually adjusted by the screws |08.

The upper end portion of ,the plunger 18 i's longitudinally grooved, as indicated at V| |0with such grooves extending below the opening 8| so that fluid may flow between the valve chamber 13 and the adjacent end of the cylinder 2|.

The fourth valve in the seriesis a restoring agarran-4 9 valve designated* generally at ||f| and con'ip'ris-V ing a rectangular housing H2 secured by screws I3 to the rear surface of the frame end I6. This is also a plunger or piston type valve having a reciprocable plunger H4 mounted in a bore ||5 in the housing, which bore opens through the end of the housing nearest the turret slide C to pass a stem I I6 extending in that direction from the plunger. The plunger has two spaced enlargements IH and HB.

Two closely spaced ports H9 and |20 are Vformed in the top of the housing H2 opening into the bore H5, and in these are screwed fittings |2| and |22. A tube or line |28 connects one (I2 l) of these fittings tothe inlet chamber 58 in the reversing valve 52 by a connection |24 seen in Fig. 2, so that high pressure fluid will flow to this restoring valve HI regardless of the condition of valve 52. The other fitting |22 is connected by a tube or line |25 to a litting |26 which enters the bore 53 in valve 52, at'the end nearest the turret.A

A drain port .|27 in the housing l2 also communicates with the bore H adjacent the end from which stern H6 projects and leads to a fitting 1| 28 by which a connection is made to a drain line indicated diagrammatically at |29 leading to the pipe 33, or directly to the fluidV reservoir; Y The valve plunger H4 is movable to and' between two positions, in a direction parallel to the travel of the turret slide C. In what may be called its normal position the .plunger H4 is so disposed (Fig. 3) that its enlargement H1 closes the port H9 while both of ports |28 and |27 are open. Fluid may thus drain from the end of the bore `53 of reversing valve 52 through the lines |25 and |29. In its actuated positiony the plunger H4 is moved to the left as viewed in Figs. 3 and 4' to or slightly beyondv the position of Fig. 4 andthe enlargement H1 lclears 'the' port H9 while the other enlargement I9 closes the drain port |21; In this position high pressure fluid Q from the'inlet chamber 5S in reversing valve 52 may flow through the ports H9 and |216 and line |25 into the end of the bore 53 of said valve.

The valve plunger v| |4 of the restoring Valve fI is moved alternately betweent-hese respective normal and actuated positions by an actuating finger |30 and a stud |'3a adapted to 'engage a cap 13| secured to the extremity of 'the plunger stem I6. Said cap has a diametricallyY enlarged flange |32 the peripheral surface of which A' is beveled off as indicated at |33 toward the turret slide.- The nger |36 is carried by Vand depends angularly downwardly and rearwardly from the head |34 of a rock shaft 135 there- 'duced shank of .which is oscillatably supported in a tubular bearing |36 mounted in the rear end of theplate 29 secured to the end of the piston rod 23. A torsional coil spring |37 is coiled around the shaft |35 and is anchored at opposite ends at' |33 and |39 to the .head |34 and bearing |36 respectively. This spring angularlyy biases the'shaft |35 so that it normally rotates in a direction to swing the lower end of the finger |30 in a rearward direction and this spring influenced movement is limited by a stud |46 carried by the shaft and playing in a slot |4| in the bearing |36 as clearly shown in Fig. 5. The axis about which the shaft |35 oscillates is parallel with the piston rod 23 and located above the valve plunger stem H6 and the arrangement is lsuch that, as the turret slide C moves back -on its return stroke the finger |30 will pass the cap |3|'. A guide |42 is secured by screws |43 to the moves back toward the valve A| l2 onthe returnstroketofthe slide C'the finger is cammed by the end |44, las the finger passes thercap |3|, to a nearly vertically depending position. The stud |30a screwed at |3||b in the'platewill, after the finger |30 passes cap 13|, contact the same and push the plunger stem to'the leftas viewed Vin Fig. 5, thus moving'the restoring valve plunger H4 from' its normal to its vactuated position of Figfl as'previously described. OntheY next movement of the slide C' (to the right in Fig. 4) the finger will now pick-up the cap, contacting the sharp edge of the flange |32 and so pull the valve plunger back to its normal position of Fig. 3. The finger then clears the flange |32 as it swings back and travels out along the angled end |44 of the guide.

vThe nal lvalve in the series, indicated geni erally at |45, is a back pressure valve and vcomprises a rectangular housing |45 having a bore |41 extending through from end to end and downwardly extending'inlet and outlet ports |48 and |49 which meet some distance below the'bore at a tapped recess |56 which is screwed upon the nipple 'l of vthereversin'g valve 52. This connection not 'only places the 'twovalves incommunication with each-other forfluid transfer but mechanically supports the'valv'e '|45' itself. The inlet port |46 is formed with a seatl to accommoda'te a check valve ball |52 which is normally urged down to the seat by a springv |53 as clearly shown.V The outlet port |49'is normal-V ly closedolf by 'a back pressure valve piston |54 which is urged across this port, toward port' |48 by a spring |55 bra-ced between the piston'and a threaded plug |56 in the adjacent end of the bore |41. Such spring biased movement of the piston |54 is limited bya stop pin |`5l traversing the bore |47.. The end ofl this bore |47 vopposite the plug |55-V hasv a fitting |58 from which 'extends a return tube or line |59 leading to a fitting |66' in the top of the 'frame end i6 and communicating through a duct 6 with the adjacent Y end of the cylinder 2 I. A

The reversing valve 52 is completed by a plunger designated'vgenerally at |62 having a stem |63 extending slidably out through an open'- ing |64 in the housing end casting 54. The op-V posite end of the plunger is engaged by anexpansionl'coil spring |65 braced between the plunger and a shoulder around the opening |65 leading Yto the aforesaid tting |26l and the plung- 'er isV thus urged tothe leftV as viewed in Figs. 3 and 4' until such movement is halted by a stop shoulder |51 on its stem |63 as clearly seenin Fig..3. This then is the normal position of this valve plunger |62 and from this position the plunger is movedto the right or toward the turret to an actuated position as seen in Fig. 4, this movement occurring asl the turret D reaches the end of its feed or working stroke. Y

The plunger |62 has three spaced enlargements or valves |68, y| 69 and l'lllvand in normal posi tion (Fig. 3) the enlargements |68 and |69`clear the adjacent grooves 64', 66, 5,9, and 61, while enlargementl'lll closes the Vgroove 65. Fourways or passages are thus open in the valve. In actuated position (Fig. 4) the enlargement |63 closes groove 64 while" now enlargement |10 clears groove'65 'thus again leaving four ways or pas,-

sages open. The inlet chamber v56 is not closed yin either position but-is intermittently connected `to outletttingsv 10 and 1I,v while the outlet or drain chamber 6| is alternatelyv connectedv lto these fittings as will be apparent upon comparison of Figs. 3 and-l. I

. The valve plunger |62 is movedfto'- and between lsuch positions under control of an actuating lever- I'II which is fulcrumedl intermediate its zends in a fork in the outer end of the cylinder plug 85, upon a pin |12. The lever extends in a generally vertical plane and its upper endk is angled at I`13- toward and'into contact with the extremity of the plunger stem |63. Thef`lower end of the lever depends below the levelof the frame base plate I5 and is pivotally connected at l I1 to a link |15 which in turn is pivoted atl|16 to a push rod 111.,"S-aid rod |11 is slidably `supported through bracket lugs- |18V depending-from the .base plate I5vand extends toward and beneath the turret slide support B. Asleeve. |19 is :secured in and carried by the lugs and slidably `supports the rod |11 extending out beyond the free end thereof as seen in Fig.A 1. An expansion coil spring |80 is braced between one 'of the lugs |18 and a collar |8I (Figs. 3 and 4) securedon the rod |11 biases the same in a direction such that the upper end of thelever I1| :willswing vtoward valve plunger stem |637. Y Referring now to Fig. l IA show therein alatch Vmember or dog |82 which is pivoted on-a pin L83 .in the slotted end of the sleeve |19 projecting beyond the` free extremity of the rod |11. This latch |82 has a hook Vv|84 adapted to normally downwardly engage a notch |85 in the rod |11, under influenceof a leaf spring |86, which tends .to oscillate thelatch ina clockwise direction as viewedv here,. thus locking the rod |11 against movement by the spring |80. An arm |81 is.. extended upwardly from the vlatch I 82 into the .path of the lowermost stop screw K and thearrangement is such that, as the turret slideC, which carries the disk J for the screws K, reaches the end of its desired feedY or advance motion the lowermost screw K will engage the arm |81 and A stop is provided to limit movement' of the plunger |62 of the reversing valve toward its actuated position of Fig. 4 and this stopjcomprises a slide |89 slidablysupported in a bracket |90 secured to the front side of the frame end I1 and provided with a hand knob ISI onv its forward end. The rear end of the slide has a fork |92 which may be pushed backastraddle the `plunger stem |63 in position to engage an'enlargement or head v|63 on the outer end thereof and so stop the plunger movement short of the f completion of its movement by the actuating lever |1I.

Operation of Figs. 1-6

Assuming the turret slide C and turret D to be in normal position withdrawn from the work, the machine is set in operation by moving the handle 46 to its center position of Fig. 1 which, through cam 13| as previously described, opens the valve 38. High pressure fluid now flows from the supply line 32 through this valve and through the nipple 5| into the inlet chamber 58 in the revers- 'ing valve 52. T he plunger |62 of this valve52 is nowsin normal positionof Fig. 3A and the fluidv .Hows through grooves 59 and 61 into" chamber 69 and thence' out through'the tting 1I andline`15 to fittingA ,14 land thence into thelchamberf13 'of the mf-:jteriixgl-valve.v .The ball 12 ofthis valve is Y,.un'seated',by'. meteringplun'ge'r 18 so that it can- A'not .act asa'checkand'the iuid will thus ilow .throughy the-'grooves `I I0," inplunger 1 Sfan'd jthrughopenings SI-fa'nd |36V into Athe, end ofthe' "cylinderfZI Such'entran'ce of the fluid intojthis endV ofthe cylinder obviously Will'force the.' piston 22 ,toward the Work and the'movement'of vthe 'piston' rod 23 willbe transmitted throughthe bracket connection 24 to the turret slide C.

i, ySince the lifting p in 82 initially holds the .meteringplunger 18 Well `up in its bore 19, the ball `12 will stand far'enough above its'seat 16.

so th'at'fluid mayirow. rapidly into the' cylinder fand as a resultthe ini'tialgadvancel movement o f I ahe:turret slide will'b erapid.v ',Such rapid advanceor approach movementiwill continue until theN lifting .pin 82 clears theopening 8|"in themetering plunger 18"whereup'on the position of k.theplunfgerlil is regulated by the adjustment of r,themetering pin I0| vthen disposed below the spring I 03. Assuming the position of this meter- `ing pinIUI `to be such that plunger lvjmay, fall .as lifterv pin 8 2 clears then at this point the speed of the'advance movementof piston 22 andy turret "slide C will be reduced,`ldue to ball 12 reducing the volumetric ilow throughxthe metering valve. Y `When the advance or feedingv movement of [the turret slide is completed the lowermos'wt stop pin K will strike thearm, |811of the 'latch |82 causing the hook |64 to release the actuating rod Illandl the springl |80 then moves this' rod to Ythe left as viewedfin Figs. 3 and 4, or opposite to the advancemovement of the turret, andY actuating lever |1| translates this movement to 1an opposite movement of the plunger |62A of the reversingvalve 5.2 moving it to its actuated position of Fig. 4; Now thefluid iiow is reversed to thejcylinder 2|, the ow from the pressure :inlet chamber58iof the reversing valve being through groovesr and lthrough nipple 10 into cham- ',ber 50 of thel back pressure valve |45 and'thence jthrough portjldpast the check valve ball;4 |52,-

which'is unseatediby the fupward pressure, int'o the, borejl 41 of Yvalve |45and thence out through .fitting |58 and into theY line |59. 'I his fluid thus jenters the fitting |60 and flows through ductl |-6I "intothe'end of the cylinder 2| nearest the'turret .exertingja pressure onfthe piston 22 tending to return the turret slide C toward starting position. At'jthe same time Athe exhaust chamber'II of the reversing valve, leading to discharge pipe 33,`is connected through duct' 63, grooves 65land l 61vto the Ychamber 69"which,ras aforesaid, lisvcon- 'nected to the metering valve chamber`1-3. Thus 60.i`22' "r"e'rnote' from the turret may discharge rap- ;idlly Aby;unseating the Yball '12 vand the piston 22 thejfluid in cylinderZI'on the Side of the pistn Wi 1lmove",back"to starting position*` to complete one'strokeof theturret and slide.

65A" "Assuch `stroke is completed the turret D-is rthe Work, and the finger I 30now also engages l fthe restoring valve cap |3I jmoving'the-plunger V|14 of this valve III tof actuated position (Fig. 4)

indexed to bring up a'neW tool station toward at whichjhigh pressure fluid is admitted through then'may ow through -port |20 into' tting |22 and line I25through fitting |26 into lthe end-0f -the bore 53- of the `reversing :valve 52y and the thigh pressure thus exertedonthe `reversing valve of the cylinder remote from the turret to start another working stroke.' 'I'he fluid ahead of the piston 22, which previously returned the parts to starting position, flows out through duct |6I, fitting |60, line |59 and fitting |58 into the back pressure valve bore |41. Here the fluid is checked by ball |52 from returning to the high pressure system but the pressure of the displaced fluid is exerted against'the piston 54 to move` it back and clear the -port |49 so that this fluid may return via the chamber |50, nipple 10, chamber 68, grooves 66 and 64 to the duct 462 leadingto the discharge chamber 6| of the reversing valve V and thence to discharge pipe 33. The resistance of the piston |54 to displacement by the fluid creates a back pressure on the travel of the piston 22 toward the turret such that a cushioned, chatter free feeding movement of the turret and tools is assured.

The new advance movement of the turret slide is accompanied by a return of the restoring valve plunger ||4 to its normal position, by the pickup action of the finger |30 as previously described, and thus the high pressure flow to the end of the reversing valve bore 53 is shut off. At the same time the drain port |21 is opened to the port |20 leading to the line |25 and this fluid, which previously restored reversingV valve plunger |62 to normal position and relatched the actuating rod |11, is enabled to drain off, or be displaced when the reversing valve is again actuated.

Each indexing movement of the turret D, at the completion of each return stroke of the parts,

Yis accompanied by a corresponding movementl of the shaft H through the gears I. Thus each time anew metering pin is brought up beneath the spring |03 so that for each successive operation a different metered rate of feed (after pin 82 clears the metering plunger 18) may be readily secured by individual adjustments of the screws |08. As previously pointed out the adjustment of these screws regulates the projection of the metering pins |0| and so regulates the position assumedby the metering plunger 18 and ball 12 for each station. The long taper of the ends of the screws |08 permits precise adjustments` while the spring |03 interposed between thepins and plunger 18 ensures a constant metered flow each ,repeat operation for the individual stations.r

The indexing operation also brings each time a new stop screw K into position for engaging the latch arm |81 and unlatching the actuating rod |11 and by adjustment of these screws it will be possible to readily adjust, for each indexed tool position, the ypoint at which the Vadvance or feed movement will be halted and the return movement, started as will be readily apparent from an inspection of Fig. 1.

When itl is desired to stop the turret with the tool-therein lfully advanced to the work the.Y knob |91 is pushed back and the fork |92 thrust into the path ofthe head |973 in the stem |63 of the reversing valve plunger |62, before the advance movement of the turret is completed. As the stop screw K :then trips the latch |82 to initiate the return movement the plunger |62 is prevented from moving to actuated position by the engagement of the head |93 with said fork |92 but instead comes to rest in a position V,at which enlargement |69 of the plunger closes the' main inlet groove 59 and enlargement |10 closes the groove 65. Thus fluid flow to and from the cylinder 2| will be halted `and the parts willV rest until the fork |92V is pulled forward, whereupon the spring will complete the movement of the reversing valve plunger to actuated position and the reverse movement of the turret will start up. The fork |92 i's'thus so positioned that it will stop the reversing valve plunger |62 from completing its movement'toward actuated position by a distance slightly greater than Ythe width of the aforesaid grooves 59 and 65.

To shut oli ythe machine the handle 46 is,'of

course, moved either V.way from center allowing the main valve 38 to close and shut ofithe flow 'of fluid to the machine, and this may be done at any point in the operation.

Once the machine is set up the operation is completely automatic with a precisely regulated reed for each tool selectively` as will be understood.

Figs. 7-13 It will be noted that in the machine of Figs. l-6, the point at which the rapid approach movement of the turret to the work shifts Vto the chosen metered feed travel is fixed, by the length of the lifter pin 82, and is the same for all-stations, or for each indexed position of the turret.

This may be a disadvantage in lsome cases since Y itself off after each complete cycle'of operationsV and not so repeat.

The mechanism'of Figs. '7-13 now to be described has these features of selective length of metered feed motion, and selective repeat control but otherwise -is essentially like that of Figs. 1-6. To avoid needless duplication of the disclosure the valvesystem and other'parts whereever common to both mechanisms is not shown in particular .detail in Figs. 7-13.

This mechanism is further shown as a cabinet or portable type separate from and not supported upon the lathe bed. The mechanism is accordingly supported atop'a base or cabinet indicated generally at L and the construction of which is itself not important to the present disclosure. It is suicient to state that this cabinet is'arranged on the floor at the end of the lathe opposite rthe work holder, vand the cabinet may well support and enclose the pump and reservoir (not shown) which supply the fluid for operating thev mechanism. Positioned on the cabinet L is a Y frame having a base plate |94, rigidly supported upright frame ends |95 and |96 and the front and rear tie plates |91 and |98 all arranged exactly as previously described.

The frame ends |95 and |96 support a main cylinder |99 one end of which (Fig. l1) is recessed into the end |96. This cylinder |99 is, however, longer than the frame and its opposite end therefore extends through and beyond the other frame end |95 toward the lathe slide, here again indicated at C, and this extremity is provided with end of the valve 205 to push the plunger thereof later appear.

Here again luidilow to the opposite ends of the cylinder |99 is controlled by five valves, designated generally as the main control or shut-off valve 204, a reversing valve 295, a metering Vvalve 206, a restoring valve 201 and aback pressure valve 208. Aside from the metering valve 206, the construction and operation of these valves 204, 205, 201 and 208 is exactly the same as the corresponding previously described valves 33, 52, and |45 and interior details are accordingly not again shown and described. It is suicient to point out the main supply line 209 from the pump to main valve 206i, the nipple 2 I0 connect-A ing this valve to the inlet chamber of the reversing valve 205,'the line 2 connecting the output of valve 224v to the metering valve inlet .fitting 2|2, the nipple 2|3 connecting Valves 205 and 228, the line 2|4 connecting back pressure valve 208 to the end of the cylinder |99 through a fitting 2|5 in the cap 200, the pressure supply line 2|`6 from the reversing valve 205 to the restoring valve 2631 and the line 2|1 connecting the latter to the back from actuated to normal position. There are also shown a main drain line 2 I8 and a restoring valve drain line 2|9 by which displaced fluid is returned to the reservoir. These connections are all essentially identical to the corresponding connections in Figs. 1-6 and the fluid flow and operation is identically the same.

It will be noted that the restoring'valve 201 is secured to the cylinder end cap 200 and its actuating cap 220 is arranged to be moved in opposite directions, as the turret slide returns to starting position from each working stroke and starts on the next, by an actuating pin 22| supported from a bar 222 secured to the main piston rod 202. Otherwise the arrangementof this valve is exactly as previously described and the operation is in no way different Turning now to the metering valve 203 and referring particularly to Fig. 11 it will be seen that the construction and operation are both similar to the metering valve in Figs. 1-6, and that the actual metering means is a ball 223 in a chamber 224 in the upper end of frameend |96, cooperating with a seat 225 and positioned with respect thereto by a metering plunger 226. This plunger 226 plays vertically in a bore 221 in the frame end |95 which communicates with an opening 226 leading into the adjacent end of the cylinder |99 and the upper portion of fthe plunger is reduced as at 229 to provide clearance for nuid in'and out flow.

In the present instance, however, the metering plunger 226 is not lifted for rapid fluid flow during the rapid approach movement of the turret slide, by the piston as previously described, but is instead raised by a lifter rod 230 which is slidably supported below cylinder |90 in a sleeve opposite end lof the lifter rod is adaptedto'pene- .trate a` tapered, diametrical opening 232 in the metering plunger 226 and pointed at 233 to.

cam the plunger upward in so doing. The sleeve 23| is secured on the frame ends |95 and |96 and the end |96 has Ian opening 234 `.to clear the pointed end 233 of the rod. The lifter rod 230 is pulled forward, or toward the turret, to. drop the metering plunger onto its adjustable positioning means later to be described, by a series; of adjustable trip dogs 235 arranged upon an indexing trip cage .or carrier indicated `generally at Said cage 236 comprises two spaced end plates or disks 231-2 38 which are rigidly connected and joined -by a series of parallel rods 239 Vequal in number and in angular relationship to the num- 'ber of tool stations in the turret. The end plate coaxial to shaft Hand this shaft is slidably keyed into a sleeve 243 which isjOurnaled and sup'- ported in and through the frame ends |95 and |96 below sleeve 23|. I

The aforesaid'trip dogs 235 are arranged one on each of the rods 239 and Veach dog has a setscrew equipped hub 244 by -which it may be secured in any adjusted position along the length of its rod, with the dog projecting radially (Fig. 12) with respect to the axis about which the cage assembly236 turns. A collar 245 is secured to the exposed end of lthe lifter rod 230 and has a ange 246 which depends into the pathfof the dog 235 which happens to be at the top of the case. Bearing in mind that the cage assembly 236 reciprocates with the turret slide C to which shaft'H is attached it will be apparent thatfas the slide approaches the work one of the dogs willengage the flange of collar 245 to move the lifter rod 230 in the same direction (to the left as viewed in Fig. 11) and will thusy pull the tapered rod free `of the metering plunger '226 to initiate the metered feeding travel of the slide as the tool enters the work. The dogs 235 being f individually adjustable lengthwise on the rods 239- Vready for the next operation. For this purpose a large disk 241 is secured by its hub 248 upon the shaft H and is adapted as the slide and cage move back or to the right as viewed in Fig. 7 to engage the flange or collar 245 and push the tapered end 23| which extends out beneath the exposed end# of the cylinder yand from which extended end the rod projects even further as seen in Fig. '7. The

of the lifter rod 230 back into the opening 232 in the metering plunger 226 as it is in Fig. 11. l

To now complete the description of the metering valve reference is again made to Fig. l1. The lower end of the metering plunger'226 is beveled off at a slight angle at 249 to cooperate with `a complementarily beveled face 250 on a metering pin 25| which is slidably mounted through an opening 252 in the frame end |96 below and in communication with the lower end of the Ibore 221. The metering pin is biased to move endwise in one direction by an expansion -coil spring 253 amiamo i whichis braced between the inner end of the pin (with respect to frame end |96) and a spring cup 254 screwed into the enlarged tapped inner end of the opening-252. The metering pin isthus urged outwardly through and beyond the outer or cx- -posed end surface of frame end |96 and in a Vdirection such as to cause the angular face 250 to -allow the metering plunger 226. to descend.

-The outer end of the metering pin is provided vwith a roller 255 and it will' be evident that pressure on this endof the pin, moving it inward against the spring 253, will cause the beveled face 250 to wedge against the beveled' end 249 of the metering plunger, urging it upward, and that the angle of the coacting wedging surfaces 249-250 is such that the position of the pin will very precisely Vary the elevation of the metering plunger. The latter factor, of course, as in the previous construction, regulates the flow past the metering valve ball 223 and the rate of travel while the turret is feeding the tools to the work. Y

The metering pin 25| is positioned for each station selectively by an indexing cup 256 which is secured at 251 to a stub shaft 258 journaled in a bearing 259 through the frame end |96 and into CII which the end of the sleeve 243 is piloted or extended as at 260. A screw 26| connects the sleeve 243 and shaft 258 so that the latter, and the attached cup 256 are rotated step by step -by the corresponding movements of the sleeve 243 from the-indexing mechanism of the lathe. Screwed into the-cup 256 are a series of metering or adjusting screws 262 the inner ends of which are rounded at 263 to engage the roller 255. These screws 262 are equal in number and angular relationship to the number of tool stations on the turret, and as each screw in succession moves to the uppermost position shown, -by the indexing action, its inner end 263 will engage the rollers 255 and thus position the metering pin 25| in accordance with the position of that screw. Selective adjustment of the metered speed is thus readily made for each tool.

The cup 256 has an annular flange 264 which .encloses and protects the inner ends of the screws and the `roller 255, and this flange is notchedrat 265 to cooperate with a spring pressed detent 266 by which the cup is accurately held in its indexed positions.

The reversing valve 205 has an operating plunger (not shown) like that indicated at |62 in Figs. 1-6, and this plunger has a'stem 261 extending out through one end of the valve housing for actuation by the upper end of a lever 26BV which isV pivoted intermediate its ends t0 the frame end |96 by a bracket 269. As seen in Fig. 10 the actuating lever 268 angles rearwardly toward its lower end bringing this end rearwardly of the plane of the lifter rod 230 and its sleeve 23| and :arranged to the rear of this sleeve but parallel thereto is another sleeve 210 wherein is slidably mounted an actuating rod 21| corresponding exactly in function to the actuating rod |11-0f Figs.

wardly instead of upwardly. The latch 214 vis positioned out over the cage 236 and the arm 21-5 depends near the rod 239 which isnext inline 156 to the rod vuppermost injthe cage assemblyat any' indexed position. See Fig. 12:. Reversing valve trip dogs 216 are provided one Yon each rod 239 and spaced from the restoring valve trip dogs 235 previously described and these dogs 216, identical inV construction to the dogs 239, are so positioned that, as the cage assembly moves forward toward the work during the approach and feed travel of the turret slide, the dog 216 upon the proper rod 239l will engage the latch trip arm 215. As this occurs the latch 214 is operated to unlatch the ac,- tuating rod 21| and the spring 212 then swings the lever 268 in proper direction to actuate the reversing valve 205 for returning the turretslide to starting position. Thek trip clogs 216 thus serve the same function exactly as the stop screwsl K `of Figs. 1 6, and are of course readily adjustable to stop the feed movement of the turret at any point for each station. K

A stop short slide 211 is also' here again provided, having a fork 218 adapted to be pushed astraddle the reversing valve plunger stem 261 in the path of a head 219v formed on the extremity thereof and so stop the plunger short of its movement to actuated position by the lever 268. The turret may thus be stopped with the tool fully advanced to the work as previously described. The slide 211 is carried by a bracket 230 on the frame and has a knob 28| on its forward end.

The main or shut-off Valve 204 is opened and closed by a lifter and stem assembly 282 and this is lin turn moved upwardly to open the valve, or allowed to fallv to'closeit, by a cam 283 secured to the rear end of a shaft 28.4. Said shaft 284 is journaled front to back through a bracket 285 secured to the base plate |94 between the frame ends |95 and |95. Forwardly of the bracket 285 the shaft has secured thereto a disk-shaped head 266 from which radially projects a handle 281 provided at its end with a knob 208 :by which the shaft may be turned toY manipulate the cam 283. The front of the bracket 285 is formed with a circular plate 289 against which the head 286 turns and normally projecting forwardly through an upper part of the plate 289 is the end 290 of a release pin 29| which is slidably mounted through suitable apertures 292 in thev plate 289 and a rear lug portion 293 on the bracket which also supports the lifter 292. See Fig. 13. A trip block 294 is secured on the pin 29| and arranged on the pin between this block and the lug 293 is an expansion coil spring 295 which normally urges the pin forward to project its end 290 from plate 289. The head 286 has an arcuate groove 295 in its rear surface which receives the pin end 290 and when the cam 283 is moved up to bring its nose 291 up against the lifter 282 and so open the valve 204 the handle 281 is upright andthe pin end 290 is at the topof ythe groove 296. The shape of the cam nose 296 is such, bearing inA mind that the lifter and stem 282 are urged downwardly by the spring on the valve 204 which normally closes the valve, that the pressure on the cam tends to rotate it and the shaft 284 in a clockwise direction as viewed in Fig. 9l or counterclockwise direction as viewed 'in Fig. 13. The engagement of the pin end 290 with the groove 2196" normally prevents such r0- tation,` however,v and the valvev is kept open.

The trip block 294 is positionedV above the sleeve 243 and has a depending ear or lug 298v which extends into the path of. a cooperating lug 299 Y upon av collar 308. secured by a setscrew 20| upon 

